0.490s-kernel: load kernel to 0x8200-0x9200

LINES

@@ -12,5 +12,7 @@
 
 2021-2-15 0.487: 487 lines, 5 files, rain
 
-2021-2-15 0.484: 484 lines, 5 files, rain
+2021-2-23 0.484: 484 lines, 5 files, rain
+
+2021-2-23 0.490: 490 lines, 6 files, rain
 

Makefile

 all:
 	touch boot/x86/bootloader.bin
 	make -C boot/x86/
+	make -C kernel/
 
+clear:
+	rm boot/x86/*.bin kernel/*.bin cunix.img
 

README.md

@@ -41,6 +41,10 @@ Cunix kernel
 `0.484s-boot`:
 &#9let `readdisk.inc` smaller, but we just can use CHS or LBA, not both. 
 
+
+`0.490s-kernel`: 
+&#9load kernel to 0x8200-0x9200 for 4KB, kernel.asm display 'K' to screen. 
+
 </pre>
 
 

boot/x86/Makefile

@@ -2,10 +2,10 @@ ASM_FLAGS = -I ../../include/
 
 remake: 
 	rm bootloader.bin
-	make cunix.img
+	make first
 
 first: 
-	make cunix.img
+	make bootloader.bin
 
 boot.bin: boot.asm
 	nasm boot.asm -o boot.bin $(ASM_FLAGS)
@@ -13,13 +13,8 @@ boot.bin: boot.asm
 loader.bin: loader.asm
 	nasm loader.asm -o loader.bin $(ASM_FLAGS)
 
-bootloader.bin: boot.bin loader.bin
+bootloader.bin: boot.bin loader.bin 
 	cat boot.bin loader.bin >> bootloader.bin
 
-cunix.img: bootloader.bin
-	dd if=/dev/zero of=cunix.img bs=1024 count=1440
-	dd if=bootloader.bin of=cunix.img conv=notrunc
-
-
 clear:
-	rm *.bin cunix.img
+	rm *.bin 

boot/x86/boot.asm

@@ -77,8 +77,8 @@ load_loader:
 	call read_sector
 	jc panic
 
-; read 8 sectors
-	add cl, 0x02
+; read 9 sectors (1 loader, 8 kernel)
+	add cl, 0x01
 	add bx, 0x0200
 
 	cmp cl, 0x0a

boot/x86/loader.asm

@@ -175,9 +175,7 @@ init_long_mode:
 	mov ss, ax
 	mov rsp, 0x0000000000007c00
 
-e:
-	hlt
-	jmp e
+	jmp 0x8200
 	
 
 message: db "Cunix is loading...", 0x0d, 0x0a, 0x00
@@ -220,4 +218,5 @@ code64 equ gdt64_code - gdt64
 data64 equ gdt64_data - gdt64
 
 
+times 512 - ($ - $$) db 0x00
 

kernel/Makefile

+ASM_FLAGS = -I ../include
+
+
+default:
+	make ../cunix.img
+
+kernel.bin: kernel.asm
+	nasm kernel.asm -o kernel.bin $(ASM_FLAGS)
+
+../cunix.img: kernel.bin 
+	cat ../boot/x86/bootloader.bin kernel.bin >> boot.bin
+	dd if=boot.bin of=../cunix.img
+
+

kernel/kernel.asm

+bits 64
+
+_start:
+	mov byte [0xb8000], 'K'
+
+	hlt
+	jmp $